Gas systems requirements for nstx u research operations 28 august 2012 peer review
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Gas Systems Requirements for NSTX-U Research Operations 28 August 2012 Peer Review. R. Raman, L. Roquemore , W. Blanchard, D. Mueller, V. Soukhanovskii , S.P. Gerhardt. NSTX-U Plasma Operations Requires Capability for Gas Injection form Multiple Locations. 1) Plasma Fueling

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Gas systems requirements for nstx u research operations 28 august 2012 peer review

Gas Systems Requirements for NSTX-U Research Operations28 August 2012Peer Review

R. Raman, L. Roquemore,

W. Blanchard, D. Mueller,

V. Soukhanovskii, S.P. Gerhardt


NSTX-U Plasma Operations Requires Capability for Gas Injection form Multiple Locations

1) Plasma Fueling

  • Inductive Plasma start-up: Low field side gas injection (D2) [CD-4]

  • Inductive H-mode initiations and Ip ramp-up: Center stack gas injection [Ops]

  • Density control during Li operation: Additional gas injection from LFS & center stack or shoulder gas injection [Ops]

    2) CHI Start-up [Research]

  • Branch 5 gas injection from divertor gap

    3) HeGDC

  • Low field side (LFS) [CD-4]

    4) Boronization

  • Up/down organ pipe locations & LFS [CD-4]

    5) Div. heat flux mitigation studies

  • Localized divertor impurity gas injection at multiple locations [Research]

    6) Disruption Mitigation studies

  • MGI from multiple locations [Research]


Summary of nstx nstx u gas systems yr 1
Summary of NSTX / NSTX-U Gas Systems (YR 1) Injection form Multiple Locations

RED: new port location, Green: port to be identified, Black: work in progress


Divertor mgi gas systems upgrade yr 2 or later
Divertor & MGI Gas Systems Upgrade (YR 2 or later) Injection form Multiple Locations


Nstx u gas injection delivery system
NSTX-U Gas Injection / Delivery System Injection form Multiple Locations

Injectors in Black and Red are for YR-1 availability. Injectors in Green are for YR-2 or YR-3 availability


Nstx gas delivery system
NSTX Gas Delivery System Injection form Multiple Locations

SGI & Bay-E (& Argon and GPI) systems use existing gas delivery system controls – So these are a Hybrid of the present 1-4 gas delivery system


Examined installation of a single large 6-inch port to support three gas injectors and found the only location identified (Bay F/G Lo) to be unsuitable due to severe interference with the Thomson Scattering system


Ion penning gauge locations
Ion / Penning Gauge Locations support three gas injectors and found the only location identified (Bay F/G Lo) to be unsuitable due to severe interference with the Thomson Scattering system

Existing digitizers and cabling can be used, but need to ensure digitizers support 10 sec operations


Reference plan install four 2 3 4 inch ports 1 5 inch dia pipe on the vessel wall
Reference Plan: support three gas injectors and found the only location identified (Bay F/G Lo) to be unsuitable due to severe interference with the Thomson Scattering system Install Four 2-3/4 inch ports (1.5 inch dia. pipe) on the vessel wall

  • Port-1 & 2: Bay I / J Mid-Lo (2 ports at this location for Inj. 2 and MGI-4)

  • Port 3: Bay F / G-Left Mid-Lo (1 ports at this location for Inj. 3)

  • Port 4: Bay B/C - MIG-3 (1 port)

  • MGI-5 mid upper [Bay F upper Horizontal Dome]

  • Port near Turbo pump for MIG-4 (1 port, but not on vacuum vessel)

  • OPTIONAL spares- Install one additional port in Bay F/G-Right-Right & Bay G/F-Up (GPI Upgrade)


Number of gas delivery systems needs to be increased from 4 to 6
Number of Gas Delivery Systems Needs to be increased from 4 to 6

  • System 1 (D2) [Mid-plane GIS]

  • System 2 (He for GDC)

  • System 3 (D2) [Mid-plane GIS]

  • System 4 (D2) as on NSTX [CS & Branch-5 GIS]

  • System 1-H (D2 and impurity gas) SGI & Bay-E Lower

  • System 1-H (3 impurity gases) as on NSTX Argon and GPI

  • System 5 (5000 Torr) for MGI – NEW for YR1

    • Will support Divertor Gas Injection system

    • Improves flexibility by freeing up SGI delivery system

  • System 6 (for new Boronization system)

Bill Blanchard to investigate if System 5 and 6 could be combined into a single system


New boronization tmb gas delivery system would have additional safety measures
New to 6Boronization (TMB) Gas Delivery System would have additional safety measures

  • Doubly-contained piping

  • Diaphragm or bellows sealed pumps

  • Soft seal valves

  • Flow monitoring or limiting devices

  • Gas cabinets with appropriate purging

  • Automatic monitoring of the secondary eneclosure

  • Installed in test cell


Some scope is with nstx operations and some with the upgrade project
Some Scope is with NSTX Operations, and some with the Upgrade Project

  • Upgrade Project Scope: Restore previous operations capabilities

    • Outer vessel penetrations for replacement valves and gauges [CD-4]

    • Plumbing to all LFS and CS injectors [CD-4, Ops]

    • Restoration of at least partial divertor gas injection (single divertor gas injection at bay E as before) [Research]

  • NSTX Operations Scope: Prepare for physics program (in rough priority order)

    • Additional gas delivery system for boronization

    • Full divertor gas injection (2 injectors top, two bottom)

    • Additional gas delivery system for the high pressure impurities (System #5, for MGI and Divertor injection)

    • Second MGI location in upper horizontal dome port (requires plate modification)

  • Should begin basic engineering assessments of these tasks in order to refine prioritization


Appendix
Appendix Upgrade Project





Photo of bay i j mid lo ports 1 2
Photo of Upgrade Project Bay I / J Mid-Lo (Ports 1 & 2)

Two gas injection ports removed to provide space for tangential NBI port



Photo of bay g mid lo port 3
Photo of Upgrade Project Bay G Mid-Lo (Port 3)


Mig 4 port port 4
MIG-4 Port (Port 4) Upgrade Project

Outside and inside views



Chi brach 5 injectors
CHI Brach-5 Injectors Upgrade Project


Branch 5 injectors
Branch 5 Injectors Upgrade Project

CHI-2 & Penning gauge

CHI-1


Chi 1 bay k bottom port
CHI-1 Bay K bottom port Upgrade Project


Chi 2 penning gauge bay g bottom
CHI-2 & Penning gauge Bay G Bottom Upgrade Project

Install Tee and install both the Penning gauge and a second line for CHI gas injection





Organ pipe usage
Organ Pipe Usage Upgrade Project



Center stack mgi 3
Center Stack & MGI-3 Upgrade Project





Penning gauges
Penning Gauges Upgrade Project

  • PEN-1 Bay G_LD (PG1P)

  • PEN-2 Bay K_UP (PG2P)



Chi 2 penning gauge bay g bottom1
CHI-2 & Penning gauge Bay G Bottom Upgrade Project

Install Tee and install both the Penning gauge and a second line for CHI gas injection


Plenum sensotec requirements
Plenum Upgrade Project Sensotec Requirements


Chi mgi divertor plenum sensors sensotek
CHI/ MGI / Divertor Plenum Sensors ( Upgrade Project Sensotek)


High and low field sensotek sensors
High and Low Field Upgrade Project Sensotek Sensors


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